HDD's are not unique, but are random enough for your database to not automatically be able to be run on any other random machine - but there are other secrets you could lift off your machine, if you want something else. HDD is quicker to get at than some things though.

Can you tell us more about the other secrets that can be lifted and how one might get that value.

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Whilst looking at securing a database you might want to think hard about un-securing it again. Most people do this for the value of the database and to stop people copying it and normally don't think of the customer.

If somebody has paid a lot of money for a database and then has a hard drive failure, they change the hard drive to a new one with a different number, restore a back-up and expect to be working again.

If you are going to charge good money you need to be in a position to fix things a bit quick or will have a very disgruntled customer.